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1 (The nose and mouth make up the first part where air enters your body. 2  The trachea, or windpipe, is the second part and it delivers air to the lungs. 3  Your lungs are the third part where oxygen is absorbed by the blood, which brings it to the rest of the body. 4  Finally, the diaphragm is the fourth part.
Nose or mouth. The nose is the best route for air to get into the lungs, as it is a better filter than the mouth. The nose decreases the amount of irritants that reach the lungs, whilst also heating and adding moisture to the air. Mouth breathing is usually needed when exercising or when more air is needed, because the nose is not the most efficient way of getting large amounts of air into the lungs. Journey down the windpipe. After entering the nose or mouth, air travels down the trachea or windpipe. The trachea is the tube lying closest to the neck. Behind the trachea is the oesophagus or food tube. Air moves down the trachea when we inhale and food moves down the oesophagus when we eat. The path air and food take is controlled by the epiglottis, a gate that prevents food from entering the trachea.